You probably got a crappy Chinese hookah form a local shop that over-price it ridiculously. It probably came in a styrofoam box as well. The piece is probably on a display hookah in the shop because someone stole the original one from the display hookah so he just took it out of the box he sold you and put it on the display. And whether by accident or not, sold it to you.

You have to go to the shop to see if he has another, which he probably will tell you that you must have lost it and can't sell one to you, so you should stick with what your doing.